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Property, Plant, And Equipment, At Cost (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property, Plant, and Equipment [Line Items]      
Assets held for lease, accumulated depreciation $ 8,000,000 $ 4,000,000  
Capitalized interest 500,000 400,000 2,000,000
Depreciation expenses 33,000,000 29,000,000 23,000,000
Land [Member]
     
Property, Plant, and Equipment [Line Items]      
Assets held for lease 3,000,000 3,000,000  
Land Improvements [Member]
     
Property, Plant, and Equipment [Line Items]      
Assets held for lease 2,000,000 2,000,000  
Buildings [Member]
     
Property, Plant, and Equipment [Line Items]      
Assets held for lease 66,000,000 66,000,000  
Machinery And Equipment [Member]
     
Property, Plant, and Equipment [Line Items]      
Assets held for lease 38,000,000 38,000,000  
Construction Of The Office Building [Member]
     
Property, Plant, and Equipment [Line Items]      
Capitalized interest     1,500,000
Capitalized Interest Costs [Member]
     
Property, Plant, and Equipment [Line Items]      
Depreciation expenses $ 300,000 $ 300,000 $ 200,000